Unit 5: From Earth's Orbit to Mars

In the last unit, we saw how a spacecraft reaches Earth
orbit and maintains that orbit by traveling extremely fast. Now we will
look at what it takes to move beyond Earth orbit and travel into space.
We'll also look at how a spacecraft maneuvers in space when there is
little gravitational influence. Finally, we'll apply these concepts
to different ways of getting to another planet: quickly versus inexpensively.